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Hardware Reference Manual 125
Intel
®
IXP2800 Network Processor
Intel XScale
®
Core
3.11 Intel XScale
®
Core Gasket Unit
3.11.1 Overview
The Intel XScale
®
core uses the Core Memory Bus (CMB) to communicate with the functional
blocks. The rest of the IXP2800 Network Processor functional blocks use the Command Push Pull
(CPP) as the global bus to pass data. Therefore, the gasket is needed to translate Core Memory Bus
commands to Command Push Pull commands.
This gasket has a set of local CSRs, including interrupt registers. These registers can be accessed
by the Intel XScale
®
core via the gasket internal bus.The CSR Access Proxy (CAP) is only allowed
to do a set on these interrupt registers.
Figure 26. Intel XScale
®
Core-Initiated Write to the IXP2800 Network Processor (Continued)
A9696-03
Byte 1
Write
M[7:0]
M[15:8]
M[23:16]
M[31:24]
X [7:0]
X_BE [0]
X [15:8]
X [23:18]
X [31:24]
Word Write by Intel XScale
®
Core
Intel
®
IXP2800
Network Processor
Intel
®
IXP2800
Network Processor
X_BE [1]
X_BE [2]
X_BE [3]
Byte 0
Write
Word 0Word 1
Byte 1
Write
Byte 2
Write
Byte 3
Write
M[7:0]
M[15:8]
M[23:16]
M[31:24]
X [7:0]
X_BE [0]
X [15:8]
X [23:18]
X [31:24]
Long Word (32 bits)Write by Intel XScale
®
Core
X_BE [1]
X_BE [2]
X_BE [3]
Byte 0
Write